创建下面这个文件freemem.sh，我放在/opt/freemem目录下。

#!/bin/shTime1=`date +%Y%m%d`Time2=`date +%k:%M:%S`cd /var/log/freemem##echo "">memstat_$Time1.log#echo $Time1--$Time2 >>memstat_$Time1.logecho "------------------" >>memstat_$Time1.logecho "The mem stat is :" >>memstat_$Time1.logecho "" >>memstat_$Time1.logfree -m >>memstat_$Time1.logecho "" >>memstat_$Time1.log#syncecho "....Freeing......" >>memstat_$Time1.logecho "">>memstat_$Time1.log#echo 1 > /proc/sys/vm/drop_cachesecho 2 > /proc/sys/vm/drop_cachesecho 3 > /proc/sys/vm/drop_cachesecho "---> OK ! " >>memstat_$Time1.logecho "">>memstat_$Time1.logfree -m >>memstat_$Time1.logecho "=========================================================================">> memstat_$Time1.logecho "">>memstat_$Time1.logecho "">>memstat_$Time1.logcd -cat /var/log/freemem/memstat_$Time1.log

给予执行权限

chmod 755 /opt/freemem/freemem.sh

创建日志目录

mkdir /var/log/freemem

定时执行freemem.sh

以crontab方式：

vim /etc/crontab#每隔6小时执行一次*  */6  *  *  *  root  /opt/freemem/freemem.sh